But he got stuck at AAA with the Expos into 1993, until he was finally released that April.

Mack's release by the Expos would prove to clear his path to the majors. He signed on with the Mariners, spending the rest of 1993 at AAA Calgary. He returned for 1994. Then, in June, Mack got the call up. He also had the debut every player dreams of.

Against
the Royals June 16, 1994, Mack went 3-5 with two doubles. One of those
two doubles came in his first major-league at-bat. Mack had only been
called up hours earlier, then placed in the lineup when regular
outfielder Eric Anthony got sick, according to the wire account.

Three
days later, in his fourth major league game, Mack was the center of
attention, for the wrong reasons. Mack was playing center field, as
regular center fielder Ken Griffey Jr. was the designated hitter. Manager Lou Pinella planned to put Griffey in the field in the eighth. But he waited too long, according to the wire account.

In the seventh, Royal Greg Gagne
hit a liner off Mack's glove for an inside-the-park home run. It was
initially ruled an error, but then overturned to a home run, according to the wire account. Regardless, Pinella wasn't happy.